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java.lang.NoSuchMethodError: org.apache.log4j.Logger.getAllAppenders()Ljava/util/Enumeration;	at org.hyperic.sigar.SigarLog.isLogConfigured(	at org.hyperic.sigar.SigarLog.getLogger(	at org.hyperic.sigar.SigarLog.getLogger(	at org.hyperic.sigar.SigarLog.debug(	at org.hyperic.sigar.Sigar.(